On 25-Feb-05 Melanie Vida wrote: > For a financial data set with large variance, I'm trying to > find the outlier threshold of one variable "x" over a two > year period. > I qqplot(x2001, x2002) and found a normal distribution. > The latter part of the normal distribution did not look linear > though. > Is there a suitable method in R to find the outlier threshold > of this variable from 2001 and 2002 in R?
I don't see how you can infer a normal distribution from qqplot(), which simply compares the distribution of x2002 with the distribution of x2001. See ?qqplot for what's available and what they show. You can check normality with a qqplot() with, e.g., qqnorm(x2001) qqnorm(x2002) or qqnorm(c(x2001,x2002)) if you want to look at their combined distirbution. Have another look at your data, with appropriate method! Best wishes, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 094 0861 Date: 25-Feb-05 Time: 18:54:19 ------------------------------ XFMail ------------------------------ ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
